SRIVASTAVA, Rekha, and Hanaa M. ZAYED. “Subclasses of Analytic Functions of Complex Order Defined by Q-Derivative Operator”. Studia Universitatis Babeș-Bolyai Mathematica, vol. 64, no. 1, Mar. 2019, pp. 71–80, doi:10.24193/subbmath.2019.1.07.